This offers a great opportunity to do things once only rather than doing them each time the relevant instructions are executed.

这提供了一个很好的机会，可以只执行一次操作，而不必每次都执行相关指令。

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Carl: You can't pass up this job.This kind of opportunity comes only once in a lifetime.

卡尔：你不可错过这个工作。这种机会一辈子才有一次。

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Handy and handymax dry bulk specialist FreeSeas has identified the current market turmoil as a historic opportunity to acquire vessels that may come only once in a generation.

小件和干散杂货运输专业公司FreeSeas认为，目前这个市场的混乱是一个历史性的买船机会，这种机会也许一生只能遇到一次。

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"This is an opportunity that only comes around once every hundred years, " says 19-year-old Yu Tingting.

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This kind of character, this kind of opportunity, would only happen once.

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"I think we have an opportunity to transform the economy, an opportunity such as we have only comes along once in a lifetime, " he says.

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